California water operator exam coming up? Practise the way the real test is built.
Water Operator Pass is exam practice for California Distribution D1 and D2 (Treatment T1 and T2 are on the way). Every question is original and written to the state's own published exam blueprint — the same topics, in the same proportions, as the real 100-question exam.
Free 10-question mini-test. No card, no sign-up to start.
About 4 in 10 candidates fail first time. It's not a knowledge problem — it's a preparation problem.
~63%
D1 pass rate, 2025
~64%
D2 pass rate, 2025
~58%
T1 pass rate, 2025
~61%
T2 pass rate, 2025
In California's official published results for 2025, the pass rates were about 63% for D1, 64% for D2, 58% for T1 and 61% for T2. Most candidates study from whatever questions they can find scattered online, with no idea whether the mix matches the real exam. The state publishes exactly what each exam covers and in what proportions — the Expected Range of Knowledge. Water Operator Pass is built directly on that document, so the practice you do is weighted the same way the real test is.
Failing is expensive, too. The state exam fee is $62 for Grade 1 and $81 for Grade 2 — plus the re-exam fee, plus the weeks of waiting to sit it again.
What you get
- 300 practice questions for your grade, weighted to match the real exam's topic mix.
- A full 100-question timed exam simulator, built in the same proportions as the real test.
- Maths drills with fully worked solutions — every calculation shown step by step, using the same formulas and constants as the formula sheet you're given in the real exam.
- Practice by topic when you want to drill a weak area, with an explanation after every answer.
- A score report after every session showing where you're dropping marks, topic by topic.
- Works on your phone, tablet or computer — nothing to install.
- 12 months of access from the day you buy.
D1 — Water Distribution, Grade 1
300 practice questions + 100-question simulator.
2025 state pass rate: about 63%.
$99 for 12 months.
Practise for D1D2 — Water Distribution, Grade 2
300 practice questions + 100-question simulator.
2025 state pass rate: about 64%.
$99 for 12 months.
Practise for D2T1 — Water Treatment, Grade 1
Coming soon. Leave your email and we'll tell you the day it launches.
T2 — Water Treatment, Grade 2
Coming soon. Leave your email and we'll tell you the day it launches.
How it works
- 1
Pick your grade — D1 or D2.
- 2
Pay once — $99 through secure checkout. No subscription, no monthly billing.
- 3
Check your email — your access details are sent to the address you paid with.
- 4
Practise your way — topic drills for weak areas, full timed simulations when you want the real thing, and a topic-by-topic score report after every session.
One price. One grade. Twelve months.
$99
$99 — one payment, for one grade (D1 or D2), with 12 months of access from purchase. That covers all 300 practice questions, the 100-question exam simulator, the maths drills with worked solutions, and every update we make to that grade's bank while your access lasts. No subscription and nothing else to pay. For scale: the state's own exam fee is $62 for Grade 1 and $81 for Grade 2, and a failed sitting means paying again — plus the wait.
Secure checkout by Stripe. Your access details are emailed to you straight after payment.